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Denver will mandate all city employees and private sector workers in high-risk settings to be vaccinated against COVID-19 by Sept. 30, Mayor Michael Hancock announced Monday.

Larimer County public health officials are urging unvaccinated residents to get immunized as the region sees COVID-19 case rates and hospitalizations tick up due to transmission of the contagious delta variant. The county’s daily case rate has tripled since early June to about 80 per 100,000 residents. Hospitalizations have doubled in that same time span.

This week, dozens of health organizations — from the American Medical Association to the American Nurses Association — said they support mandates that require health care workers to get the COVID-19 vaccine. The mandates are starting to trickle into Colorado.

COVID-19 cases are surging nationwide, prompting the Centers for Disease Control and Prevention this week to issue new guidance for vaccinated people to mask up in areas with high transmission rates. But if infections continue to rise, some Western states have limited how officials can respond.

The CDC sent in a team to investigate a delta variant hotspot in Mesa County, Colo. That didn't stop tens of thousands of people from flocking to the state's largest country music festival.

The humidity of where you live can play a big role in how long airborne viruses can survive. CU Boulder researchers found coronavirus particles released in a low-humidity environment remained infectious for twice as long as those in a more humid chamber.

The new approach would simplify vaccination guidance so that, every fall, people would get a new shot, updated to try to match whatever variant is dominant.

Two reports from the CDC provided details on which groups have the highest death rates and which states are seeing the largest numbers.

New Department of Education data out Monday shows that student math and reading scores have suffered over the last few years. Between 2019 and this year, data shows that fourth and eighth grade scores suffered the most in math, but reading scores also took a hit.

Here we go again. The virus is starting to surge in many European countries and there are early signs a wave may be starting in the U.S. too.

The number of women in the workforce has finally returned to pre-pandemic levels, which is good for the economy. But after time away from the job market some women are reassessing their priorities.